The 42-year-old actress exercises for two hours a day, six days a week, owns her own chain of workout studios, reported Daily Telegraph.
"Before she showers, Gwyneth makes someone go into the stall and wipe the entire shower dry. She refuses to touch what she calls 'somebody else's shower water'," a source said.
"She also refuses to use toilet paper that anyone has touched and demands an unopened package. It's nuts," the source added.